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Showing results for tags 'cylinder head ccs'.
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No certification that the heads were unmolested but this was posted in a Plymouth thread elsewhere on the web. I keep hearing guys flap about how putting an early Plymouth head on a later engine makes more compression and more power. This always struck me as foolish due to the low compression of the early motors. Today I got around to CCing three heads. The right hand one is a 54 head, center is a 37 P4 head and the left is a 36 P1 head. The P4 and the 54 head are EXACTLY the same 85cc(note the updated combustion chamber shape on the 54 head.)The P1 head is larger at 88cc's.
